<!--  -->
<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数 !" type="warning" :closable="false" show-icon></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat-opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible= true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClosed(i, scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible= true"
          >添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClosed(i, scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 修改参数的表单 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      //   级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中的父级分类的Id数组
      selectedCateKeys: [],
      //   被激活的页签的名称
      activeName: 'many',
      //   动态参数的数据
      manyTableData: [],
      //   静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //   获取所有的商品分类列表
    getCateList() {
      this.$http.get('categories').then(res => {
        const data = res.data;
        if (data.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！');
        }

        this.cateList = data.data;
        // console.log(this.cateList);
      });
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      //   console.log(this.activeName);
      this.getParamsData();
    },
    // 获取参数的列表数据
    getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return false;
      }

      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys);
      // 根据所选分类的Id 和当前所处的面板，获取对应的参数
      this.$http
        .get(`categories/${this.cateId}/attributes`, {
          params: { sel: this.activeName }
        })
        .then(res => {
          const data = res.data;
          if (data.meta.status !== 200) {
            return this.$message.error('获取参数列表失败！');
          }

          // 把 attr_vals 从字符串切割成数组
          data.data.forEach(item => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];

            // 控制 Tag 文本框的显示与隐藏
            item.inputVisible = false;
            // Tag 文本框中输入的值
            item.inputValue = '';
          });

          if (this.activeName === 'many') {
            this.manyTableData = data.data;
          } else {
            this.onlyTableData = data.data;
          }
        });
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) {
          return false;
        }
        this.$http
          .post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          .then(res => {
            const data = res.data;
            if (data.meta.status !== 201) {
              return this.$message.error('添加参数失败！');
            }

            this.$message.success('添加参数成功！');
            this.addDialogVisible = false;
            this.getParamsData();
          });
      });
    },
    // 点击按钮，展示修改的对话框
    showEditDialog(row) {
      this.editForm = row;
      this.editDialogVisible = true;
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮，修改参数
    editParams() {
      this.$refs.editFormRef.validate(valid => {
        if (!valid) {
          return false;
        }
        this.$http
          .put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            {
              attr_name: this.editForm.attr_name,
              attr_sel: this.activeName
            }
          )
          .then(res => {
            const data = res.data;
            if (data.meta.status !== 200) {
              return this.$message.error('修改参数失败！');
            }

            this.$message.success('修改参数成功！');
            this.editDialogVisible = false;
            this.getParamsData();
          });
      });
    },
    // 根据Id删除对应的参数项
    removeParams(attrId) {
      // 弹框提示用户是否要删除
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      })
        .then(() => {
          this.$http
            .delete(`categories/${this.cateId}/attributes/${attrId}`)
            .then(res => {
              const data = res.data;
              if (data.meta.status !== 200) {
                return this.$message.error('删除参数失败！');
              }
              this.$message({
                type: 'success',
                message: '删除参数成功!'
              });
              this.getParamsData();
            });
        })
        .catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          });
        });
    },
    // 文本框失去焦点，或摁下了 Enter 都会触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = '';
        row.inputVisible = false;
        return false;
      }
      // 如果没有return，这怎么输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = '';
      row.inputVisible = false;
      // 需要发起请求 保存这次操作
      this.saveAttrVals(row);
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获取焦点
      // $nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 将对 attr_vals 的操作 保存到数据库中
    saveAttrVals(row) {
      this.$http
        .put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        .then(res => {
          const data = res.data;
          if (data.meta.status !== 200) {
            return this.$message.error('修改参数项失败！');
          }

          this.$message.success('修改参数项成功！');
          // this.getParamsData();
        });
    },
    // 删除对应的参数可选项
    handleClosed(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    }
  },
  //   计算属性
  computed: {
    //   如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    titleText() {
      // 动态计算标题的文本
      if (this.activeName === 'many') {
        return '动态参数';
      }
      return '静态属性';
    }
  }
};
</script>

<style lang="less" scoped>
.cat-opt {
  margin: 20px 0 15px;
}

.el-tag {
  margin: 8px;
}

.input-new-tag {
  width: 100px;
  margin-left: 10px;
}

.button-new-tag {
  margin-left: 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
}
</style>
